GEM and Sci. data and measuurements

Counting Experiemnt using tennelec tc 534

All the counting was done by one scale tennelec tc 534.

Discriminator setup for GEM and PMT's

The counting period is 5 min for all the discriminator threshold measurements unless it is differently reported for a specific measurement.

GEM (amplified 15) without source

Voltage (V)	Number of Counts (5min)	Average ( /min)
3.0	9 , 16, 26, 32, 46	8.5 [math]\pm[/math] 0.5
2.5	62, 138, 208, 267, 329	66.7 [math]\pm[/math] 3
2.0	259, 618 (2.5min), 767, 1001, 1241	253 [math]\pm[/math] 5
1.9	1030, 2100, 3200, 4300, 5391	1002 [math]\pm[/math] 110
1.8	20667	20667

GEM (amplified 15) with source

Voltage (V)	Number of Counts (5min)	Average ( /min)
2.5	14,23,43,68,77	[math]\pm[/math] 3
2.0	116,248,391,513,640	[math]\pm[/math] 3
1.8	1674, 3350, 5037, 6680,8385
1.7	22200
1.6	57000
1.5	349000

GEM (amplified 15) without source ortec 875

Voltage (V)	Number of Counts (5min)	Average ( /min)
2.5	14,23,43,68,77	[math]\pm[/math] 3
2.0	115,262,390,508,646	[math]\pm[/math] 3
1.8	3650, 7650, 11350, 14550,17938
1.7	22200
1.6	57000
1.5	349000

PMT (R)

Voltage (V)	Number of Counts (5min)	Average (/min.)
1.00	87, 178, 254, 337, 430	86 [math]\pm[/math] 2
0.7	219,410, 585, 768, 977	203[math]\pm[/math] 12
0.35	441, 941 (2.1min.), 1383, 1853, 2354	453 [math]\pm[/math] 11
0.30	750(1.5min), 1012, 1551, 2050, 2573	509[math]\pm[/math] 8

PMT (L) (amplified)

Voltage (V)	Number of Counts (5min)
2.0	56, 110, 171, 234, 290	57[math]\pm[/math]2
1.0	263, 484, 737, 978, 1233	248[math]\pm[/math] 10
0.6	497, 1055,1632, 2114, 2655	524[math]\pm[/math]20
0.25	945,1866,2787, 3676,4643	932[math]\pm[/math]11

Counting the coincidence for the PMT's

The discriminator setup is 0.7 and 1.0 V for the Left and the right PMT successively.

Without Source

Start Date	Time	End Date	Time	Duration (min.)	Number of Counts	Count rate (cout./s)	Notes
05/08/14	17:55	05/08/14	11:32:00	325	27120	1,4	Daylight
05/08/14	11:32:00	05/09/14	06:26:00	739	61825	1.4	overnight
05/09/14	06:26:00	05/09/14	13:54:00	1187	99300	1.4	Daylight
05/09/14	13:54:00	05/09/14	21:18:00	1631	136290	1.4	Daylight
05/09/14	21:18:00	05/11/14	6:55	3648	301960	1.4

Counting GEM (2.7, 3.1kV)

GEM operating voltage is 2.7, 3.1V GEM and cathode successively, and the disc. threshold is 2.0 V.

Without source

Start Date	Time	End Date	Time	Number of Counts	Duration (min.)	Count Rate (cout./s)	Notes
05/08/14	16:14:19	05/08/14	23:37:00 (311 from 330 less by 19)	42903	311	2.3	Daylight
05/09/14	23:37:00	05/09/14	06:18:00(731)	99196	712	2.3	overnight
05/09/14	06:18:00	05/09/14	13:50:00(1183)	162485	1164	2.3	Daylight
05/09/14	13:50:00	05/09/14	21:21:00(1633)	223301	1614	2.3	Daylight
05/09/14	21:21:00	05/11/14	06:57:00(3650)	472100	3631	2.2	weekend

Counting without a source (Background)

GEM and Sci. are in coincidence, GEM detector operating voltage is 2.7, 3.1V for GEM and cathode successively, both of the PMT's have 1kV input voltage.

The disc. setup is as determined in the previous measurements, the count rate is 0.001 /min for scintillator-GEM coincidence

Counting Experiemnt using 3 scales including tennelec tc 534

GEM Counts

Without Source

Counting Time (min.)	Number of Counts	Count rate (cout./min.)	Notes
15	882	59

With Source

Counting Time (min.)	Number of Counts	Count rate (cout./min)	Notes
120	7390	60	using the new counter ortec sophiia has only 1 cout/s
120	16565	138	change to the same counter used before for GEM ortec 875 without 2.3 count/s
433	37865	87	1.4 count/s, overnight
230	29618	1.29	2.1 count/s

increasing the voltage to 2.85 kV, and 3.45 kV

without source coicidence of the three is 25 when it counted for 283 min.

with a soruce 300 counts in 970 min. ,we may need to increase the voltage again.

Coincidence Scope pictures

First Coincidence using Widest timing gate (1 usec)

Source ON

I saw about 1 coincidence perr minute with the source

Coincidence rate with soure off